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Passengers reacted in true London fashion as the participants poured in, with some refusing to acknowledge the eyebrow raising event and others taking photographs.

Social media saw residents in the capital divided over the decision, with some proudly advertising the part they played.

Some travelling saw the funny side of hundreds braving the cold to get involved.

Others, however, were less partial to the celebration of freedom, with one tweeter describing how no trousers day makes her queasy.

She wrote: "I don't want to see unknown men displaying their junk. Any girl doing it is daft."

The yearly No Trousers on the Tube celebration stems from a New York prank in 2002 and has since spread to other cities as an annual celebration of silliness.

No Trousers and proud: The idea behind the first "No Pants" in New York is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers. Pic: JUSTIN TALLIS/AFP/Getty Images

The event took part ahead of a 24-hour strike beginning on the underground on Sunday evening.